I saw one on the youtubery, that would have done a good squid imitation, about six inches long and all big brown feathers, it looked very effective.

Then I saw the photo from Dedant and these lures remind me of nothing so much as my old fave, the Tokoroa Chicken.

Tokoroa Chickens come in many shades and sizes, and most have eyes, I would think that most are designed, to emulate small smelt/trout etc. They also do well in the sea for Kahawai etc.

And just for interests sake, here below, is a photo of a couple of Tokoroa Chickens that I've tied myself, these are a pattern that I have used very effectively, on big Waikato River Brown Trout over the years, they are supposed to emulate a Koura (fresh water crayfish) escaping backwards...